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An Integrated Approach towards Highly-Efficient and Long-Term Stable Perovskite Nanowires Solar Cells

Abstract

Although organic-inorganic lead halide perovskite nanowires (NWs) have shown great potential in a wide range of device applications, their relatively low performance and insufficient stability represent major bottlenecks for their further development. In this study, we present an integrated approach to achieve highly-efficient and long-term stable methyl ammonium lead iodide (MAPbI3) perovskite NWs solar cells by combining 4-(1,3-dimethyl-2,3-dihydro-1H-benzimidazol-2-yl)-N,N-diphenylaniline (N-DPBI)-doped poly{[N,N’-bis(2-octyldodecyl)-1,4,5,8-naphthalene diimide-2,6-diyl]-alt-5,5’-(2,2’-bithiophene)} (P(NDI2OD-T2)) polymeric film as the electron transport layer (ETL) with atomic-layer-deposited Al2O3-based film as the encapsulation layer. Our results indicate that N-DPBI doping can not only improve the electron extraction capability by minimizing resistive losses, but also improve the surface coverage of P(NDI2OD-T2) ETL on MAPbI3 NWs layer. With this n-doped ETL, a remarkable power conversion efficiency (PCE) up to 18.83% is attained, which represents the highest PCE ever reported for perovskite NWs solar cells. Importantly, taking advantage of the high charge carrier mobility of MAPbI3 NWs (0.01 cm2 V-1 s-1), the large-area NWs devices with active area of 5.04 cm2 also deliver a high PCE up to 15.25%. More encouragingly, the encapsulated NWs devices exhibit excellent long-term stability, retaining ~92% of their initial efficiency after being exposed in the ambient atmosphere for more than 6000 hours. The encapsulated NWs devices still remain fairly stable (~20% loss in PCE) even after ~1500 hours of continuous operation under AM1.5G sunlight irradiation in the ambient atmosphere. The approaches demonstrated herein can not only offer a very promising strategy for realizing high-performance and long-lived perovskite NWs solar cells, but also pave the way for future developments of perovskite NWs-based optoelectronic devices.

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Publication details

The article was received on 10 Sep 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07968K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    An Integrated Approach towards Highly-Efficient and Long-Term Stable Perovskite Nanowires Solar Cells

    C. Chang, B. Tsai, M. Lin, Y. Huang and C. Tsao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07968K

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